Loom attachment



Oct. 18, 1932. Q HARGREAVES 1,883,370

LOOM ATTACHMENT Filed Jan. 22. 1929 INVEN'I OR Clifford Hargreaves BY giTTORNEYS Patented Oct. 18, 1 932 UNITED sTArEsPArENr OFFICE crrrronnHARGREAVES, or DRUMMONDVILIQE, QUEBEC, CANADA, Assrsnon r0 CELANESECORPORATION or AMERICA, A CORPORATION or DEL WAR I LOOM ArrAcHmENr iApplication filed January 22,1929. Serial No. 334,184.

This invention relates to an improvement in looms, and particularlydobby looms, wherein the number of bars in'the pattern chain may bematerially reduced when fabrics having .a weft of different k nds ofyarns are to be woven An object of my invention is to provide anattachment for looms, whereby the number of bars on the pattern chain ofthe loom may be'materially reduced.

Another object of my invention is toprovide an auxiliary cylinder in adobby loom, which cylinder actu ates the shuttle changing mechanism, andwhich in turn is controlled by the pattern chain of the main dobby cylinder. Other objects of my invention will appear fromthe followingdetailed description.

In the. ordinary dobby attachment a loom, a, pattern :chain is provided,which chain has a series ofbars having pegs for controllingthe raisingand lowering of the shaftsof the harness for producing the de sired shedof the warp. In those cases where a change of the natureofthe fillingor, weft is required, which change may be a change of color or a changeof nature of the yarn, for

making borders, check designs, stripes and the like, pegs are insertedin the'bars of the chain, in order to control the change of the weftshuttle to efiect change of the weft. The number of links or barsrequired for this purpose is often very large, since sufiicient linksmust be provided to weave the entire pattern until a repeat of design isreached. Thus,-if

- a check designof simple weave is to be woven, wherein 50 white picksand 50 colored picks are required, if each link controls two picks,achain of- 50 b-arsis required in order to efliect the required changein the weft,"despite the fact that the number of bars required foractuating the shafts of the har-K ness to obtain thedesired weave isvery small.

In accordance with my invention, an auxiliary cylinder is provided in'dobby loom,

' which auxiliary cylinder is adapted to actuate the mechanismforcausing a change in the weft shuttle. This'auxiliary cylinder in turnis controlled by pegs, or absence of pegs, on the pattern chain of themain dobby cylinder, so that it may remain stationary for any desirednumber of picks. By this. means, thenumber of links or bars in the dobbychain maybe materially reduced.

Referring to the drawing, the figure shown therein is'aperspective viewof my-invention shown in connection with that part of aloom that isnecessary for an understsanding of the same. v I On the drawing, 1indicates the ordinary dobby cylinder that is rotatable and which isprovided with the pattern chain made up of pattern bars 2, 2a, 26,20,2d, etc. These'pat- A ternubars have the usual holes therein in whichpegs may be inserted in the required places, in order to actuate thedobbyfingers andknives in such a manner as to raise and shown in thedrawing, pattern link 2 is provided with a peg 3, the link 2a has nopeg, the

link 2b has the peg13a, while of the remaining links, some have pegsandothers do not have pegs. Y a By my invention, I provide an auxiliarycylinder 4'that is mounted for rotation and which is provided with achain or bars or links, 5, 5a, 5b, etc., which have holes therein at oneend in which pegs 6, 6a, etc., may-be inserted in certain predeterminedbars. As shown in the drawing, the bar 5 is provided with thepeg 6,while bars 5a and 5?; have no pegs. I

Thecylinder is provided with a ratchet 7, which is adapted to be engagedby a pawl 8 on the bell crank lever 9, the lower end 10 of which rideson the lever 11 that is pivoted at 11d. This lever 11 is connected bythe arm lower) the: desired shafts of the harness;

ciprocate by means of the arm 180, connecting rod 19 and rotatingeccentric 20. It will thus be seen that during the operation of theloom, the bell crank lever 9 is constantly reciprocating because of thereciprocation of the griifebars, but as long as there is a peg, such aspeg 3, on the pattern links 2,. 2a, etc., the peg will raise the lever13, arm 12, lever 11 and thus the pawl 8, so that the pawl does notengage the ratchet 7 of the auxiliary cylinder. However, if a patternlink 2a having no peg is in operative position, the lever 13, arm 12,lever 11 and the pawl 8 will drop so that the pawl 8 engages the ratchet7, and because of the reciprocating motion imparted thereto .by the arm16, the pawl will cause the; auxiliary cylinder 4 to rotate and thusbring a new bar 5, 5a, etc.,. into operative position.

The. pegs 6, 6a, etc, on the bars 5,. 5a, etc., of the auxiliarycylinder 1 are adapted to engage the arm 21 of a lever pivoted at 22,which lever has anarm 23 adapted to. engagethe upper member25, and alink 24 connected withthe lower member 26, of mechanism 27 that isconnected by the member 28 with the lever 29 thatoperates by suitablemechanism-(not shown) the shuttle holder changing mechanism. Stops 25aand 260 are provided for limiting the backward motion of the members 25and 26' respectively, these steps being; of the usual character adoptedin loom dob-by mechanisms. 7

When there is a peg 6, 6a,. etc, onthe bar 5,501,, etc., that,is in theoperative position, the arm 21 is raised and the members 23 and 2 1lowered, thus causing the hooks 30 and 31 toengage the reciprocatingupper and lower, griffe bars 17 and 18' respectively, and the lever 29isthus caused to move to. the right and, to operate the weft shuttlechanging mechanism, andthus the weft shuttle is changed, either bydropping a shuttle box or causing; a new shuttle to comev into use byrotation of a rotating shuttle holder.

The operation of the device is as follows Assuming the mechanism to bein the position shown on the drawing,.the peg 3- on the pattern link 2is in operative position and raises the members 13, 12, 11 and so: thatthe pawl 8 is out of engagement with the ratchet 7, and therefore theauxiliary cylinder 4 is stationary. The bar- 5 of the auxiliary cylinderchain being in operative position, the peg- 6 thereof raises the arm 21,and therefore the members 28 and 2a are lowered causing the hook 8Oofthe arm to engage the reciprocating grifie bar 17,. and the arm 25 iscarried forwarda-bout 3 inches, with the pivot of member 26, abuttingagainst the stop 26a, acting as. a fulcrum, and member 28. is moved I adistance of 1 causes the shuttle box to be moved in its up permostposition. On the next pick of the loom, the. griffe bar 17 andhook moveback- This motion 7 wards, and the hook 31 is caught on griife bar 18,and carried forward a like distance, so that the lever 27 merely turnson an imaginary fulcrum at its centre, and lever 28 remains in the sameposition, 1 inches from its normal position, and lever 29 remainsstationary. This continues as long as a bar 5 containing peg 6 remainedunder lever 21 with the lever 27 oscillating about its centre, and theshuttle box remains in its topmost position.

When the pattern bar 2a comes in operation, since there is no'pegthereon, the members 13,12, 11 and 10 drop, so that the pawl 8 engagesthe ratchet 7, and since this pawl has a'constant reciprocating motionimparted thereto by the motion of the grifie bars, the pawl causes theauxiliary cylinder 4-. to. rotate and bring the bar 5a in operativeposition- Since the bar 5a has nopeg, the. arm 21 drops.

and raises the members 25 and 26 out of engagement with the griife bars17 i and 18, so tha u the lever 29 is moved to the left either by theweight" of the shuttle box or-by a spring, so that the shuttle-boxisdropped and the weft shuttle is changed. On the next operation, thepattern link 2?). comes into the operative position, and since ithas'the peg 3a thereon, this peg will lift the pawl operating mechanism,and the pawl will be disengaged: from the ratchet, so that the cylindert-remains stationary. This cylinder twill remain stationary as long aspattern links 2, 2a,, etc. having pegs are. in operation, so that thesame weft shuttle remains in the loom. It is only when a pattern linkhaving. no peg is in the operative position that the cylinder 4 ismoved, and a new auxiliary bar 519- comes in operation, which may or maynot have a peg to cause the shuttle box changing mech anism to operate.

By my device, changes in Weft may be effected very simply. This changeof weft may be change of color of yarn, change of nature of yarn, ormerely change of shuttle to replenish the supply of the same. Thus if a:mixed fabric containing mixed natural silk and yarn made of an organicderivative of cellulose such as cellulose acetate in the weft is to bemade, shuttles containing these different yarns may be changed by mymechanism.

To illustrate the advantages accruingfrom my invention, the followinginstance will be given. Assuming that a striped fabric is to be wovenhaving a pattern of 20 picks red filling, 40 picks white, 20 picks red,and 80 picks white filling. If my mechanism is not used, and supposingone link ofthe pattern chain is required for each two picks, apatternchain of 80 links will be required. By the use of'my invention, apattern chain of only 8 links on the auxiliarycyli'nder r, and a patternchain of 10 links on the ordinarycylinder 1 is required. Of. the tenlinks on cylinder 1, nine consecutive ones have pegs 3a, 36 etc., whilethe tenthlinkis without a peg. Of the eight links of the auxiliarycylinder, the first has a peg, the next two have no pegs, the fourth hasa peg, while the last four have no pegs. This cylinder is turned everytwo picks of the loom in the normal manner, and while the links whichare provided with pegs are in operative position, the cylinder 4 remainsstationary with a link 5 having a peg thereinunder the lever 21, so thatthe same filling of red yarn is being woven. Then the tenth link oncylinder 1, having no peg comes under lever13, it causes the cylinder 4to bring link 5a having no peg therein'under the. lever 21, and theshuttle box is dropped, thus changing the shuttle so that a white yarnis woven as filling. This continues until the tenth link on cylinder 1is again in operative position causing the auxiliary cylinder 4 topresent the link 5?) under the lever 21, but as this link has no pegtherein, the shuttle box is not changed,

7 and the white filling continues to weave for 20 picks more. The nextlink on cylinder 4 has a peg inserted, so that the shuttle box israised, thus leaving the weft shuttle with the red yarn in operation for20 picks. The next four consecutive links on cylinder 4 have no pegstherein, thus the shuttle box is dropped, and the shuttle containing thewhite scribed my name.-

said dobby pattern bars, reciprocating means co-operating with saidgrifie bar adapted to operate said auxiliary cylinder and means actuatedby said lastnamed dobby bar pegs to engage and disengage said auxiliarycylinder. g I p 3. In a loom having a dobby pattern chain of bars,mechanism for controlling the movement of the shafts of the harness, agrifi'e bar anda shuttle holder changing mechanism,"the combination ofan auxiliary cylinderhaving a chain of bars thereon, pegs on some ofsaid bars, a mechanism having a hook, adapted to engage the griffe barand con-' nected to the shuttle holder changing mechanism, a leveroperated by the pegs on the" auxiliary cylinder bars to causesaid hookto engage the grille bar, a ratchet on said auxiliary cylinder, areciprocating pawl connected tothe griife bar and adapted to engage saidratchet, pegs on the dobby pattern bars for actuating the mechanismcontrolling the movement ofthe shafts of the harness, other pegs on someof said dobby pattern bars, and mechanism operated by said last namedpegs to cause the pawl to engage or disengage said ratchet.

i In testimony whereof, I have hereunto sub- CLIFFORD HARGREAVES.

yarn is in operation for picks, thus completing the repeat of thedesign;

It is to be understood that the foregoing detailed description is givenmerely by way of illustration and that many variations may be madetherein without departing from the spirit of my invention.-

' Having described my invention what I claim and desire to secure byLetters Patent 1. I In a loom having a' dobby with pattern bars, pegsfor actuating the mechanism for controlling the movement of the shaftsofthe harness, a grifie bar, and shuttle holder changing mechanism,thecombination of an auxiliary cyllnder having pegs thereon, a

hooked arm connected with the shuttle holder j changing mechanism, alever actuated by said pegs for causing said hooked arm to engage thegrifle bar, and means, including such;

grifi'e bar, actuated by said pattern bars to cause the auxiliarycylinder to rotate.

2. In a loom having a dobby with pattern I bars, mechanism forcontrolling the 'movement of the shafts ofthe harness, a griffe bar andshuttle holder changing mechanism, the combination of an auxiliarycylinder hav-' ing pegs thereon, a hooked arm connected with the shuttleholder changing mechanism,

a lever actuated by said pegs for causing said hooked arm to engage thegriffebar, .pegs on said dobby pattern bars for actuating the mechanismcontrolling the movement of the shafts of the harness, other pegs onsome of ice

